The manual referenced by the "KOOKYE" site where you got the software links to the identical manual on the OSOYOO" site. And neither site's project make any comment on the other two wires.
Also neither site has a comment on having sold different fingerprint devices.
Can you draw up a schematic of how you have device connected to the Arduino and the power supplied to both? Did you read in the manual the sensor takes quite a bit of time to initialize after being powered up?
Paul